In a bass intensifying device for a speaker system, a passive radiator (5) constructed by a speaker having a voice coil (7) is disposed at a location where it receives a sound pressure from a main speaker (1) driven by a main amplifier (4). A motion feed-back circuit independently of the main amplifier (4) for driving the main speaker (1) is connected to this passive radiator (5). Since the motion feed-back circuit is closed only in the passive radiator (5), it is possible to reinforce the bass while preventing the motion feed-back circuit from degrading the sound quality of the main speaker (1). The selection of the main amplifier 4 for driving the main speaker is free.
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March 10, 1999
February 18, 2003
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